B-Spec Tune for BMW E46 M3

The B-Spec Tune is an off-the-shelf (OTS) E46 M3 E-Flash tune that delivers a smooth power band all the way to redline while improving engine performance over stock. Get up to 30 whp / 15 wtq over baseline tune with 20+ free add-on features including codes to turn off that annoying CEL for those going catless. Not catless yet? Purchase the tune now and get a catless re-tune for only $20 more.

Exhaust Backfire Burble Tune *

FOR CATLESS CARS ONLY. Crackles and pops with throttle taps. Make your exhaust set up sound even more aggressive.

6MT Launch Control or 6MT/SMG Dyno Mode *

FOR 6MT ONLY. Put your pedal to the floor and have your RPM bounce at the desired limiter to achieve consistent launch from stand still. This feature will disable Dyno Mode. SMG AND 6MT can also choose Dyno mode if you do not want launch control

Redline Rev Limiter RPM *

Ability to raise your redline rev limiter past stock 8000 rpm.

Startup Idle *

Idle settings upon first 30 seconds of startup.

Standing Idle *

Standing idle settings after first 30 seconds of startup.

MK20 Sport DSC Tune (Experimental)

YEAR 2001-2003 ONLY. Sport DSC Tune will adjust your MK20 DSC parameters and ignition cut off so it is less invasive during spirited driving similar to M-Track Mode on the newer E46 M3s. Please submit a picture of the location of your MK20 DSC unit to ensure compatibility with the Sport DSC tune if you would like this DSC tune to be applied.

Add-On Features

For details on what each feature does, check out the link in the Add-On Features section below.

Disable Cat Efficiency DTCs (Catless Only)

Disable Cat Protection (Catless Only)

Disable Secondary Air Pump Removal DTCs (Catless Only)

Disable Secondary Air Pump Cold Start Program (Catless Only)

Disable Rear O2 DTCs (Catless Only)

Disable EGT Monitoring (Catless Only)

6MT Shift Lights

155 MPH Limiter Removal

CSL Warm Up Light Recalibration

Sport Auxiliary Fan Curve

EWS Delete + EWS Tampering DTC Delete

Memory Sport Mode

Sport Enhanced Mode

Valet Mode

CSL SMG Shifting / Rev Matching (SMG Tune)

SMG Inertia Update (SMG Tune)

SMG Final Drive Swap

Disable ‘105’ DTC for Motorsport Thermostat

Disable CSL Intake Flap DTCs

Ignition Based Cutoff (Catless Only/Experimental/Aggressive)

Disable Automatic Stability Control “ASC” (Experimental)

Uploads for E-Flash Method

Upload your stock tune bin file (zipped) for the E-Flash method. We will also require you to submit a screenshot of your current DME Error Logs before we send you the tune to ensure safe flashing. If you require assistance, we can help you after order is placed.

Terms of Service *

Buildjournal Tuning Labs products are for off-road use only. Improving the performance of an engine by altering the engine’s computer software may cause excessive “wear and tear” to the engine and could result in damage or even destruction of the vehicle. The user assumes these risks. Buildjournal is not responsible for damage to a vehicle of this kind. Please read our Terms of Service for more information.

Description

Buildjournal Tuning Labs is proud to present our new B-Spec Tune for the BMW E46 M3. This E46 M3 E-Flash tune is an off-the-shelf (OTS) MAF based tune configuration made suitable for most environments. B-Spec Tune will deliver a smooth power band all the way to redline while improving engine performance over stock. Included with the tune, there are 20+ free add-on features for you to select including an Exhaust Backfire Burble Tune, disabling CEL for those going aftermarket headers, 6MT launch control and more. This E46 M3 tune works for any 2001-2006 BMW E46 M3 including SMG and 6MT transmissions with or without catalytic converters.

If you follow the Coding and Tuning section on M3Forums, you’ll realize that these “tunes” are available for you to create yourself, but coding is no easy task. As tuning enthusiasts and E46 M3 owners, we’ve played around with the parameters and tables. A lot. And we’re helping you tune your car, digitally.

For a full description of each B-Spec E46 M3 tune add-on feature and what it does, check out ECUWorx’s website or email us at [email protected] for a list of recommended add-ons for your setup. In addition, we have a couple of features that are not on the list:

Valet Mode – Overrides your ‘Comfort’ Mode (Sport mode off) to limit peak power and acceleration. Ideal use case is to drive normally with the ‘Sport’ button on and turn it off for Valet Mode situations.

Ignition Cut Off – When your car hits the rev limiter, on the stock ECU there are 2 stages of cutting power. First is fuel cut and the second stage is ignition cut. Fuel cut results in slower pickup in power vs ignition based cut off.

Sport DSC Tune – Similar to M-Track Mode, sport DSC Tune will override stock MK20 DSC parameters and ignition cut off so it is less intrusive during spirited driving.

Addition or removal of most add-on selections are free. A re-tune fee of $20 will only apply for the following changes as they require more time:

Catted to Catless tune after header install

Existing customers who did a SMG to 6MT swap will need to re-tune for the new 6MT

Interchange between Launch Control and Dyno Mode

Add/Remove Exhaust Backfire

Add/Remove Valet Mode

Remove Sport DSC Tune

If you need a re-tune for the above changes, you will need to submit a B-Spec Re-tune Order. For all other add-ons, email [email protected] with your existing order # and a list of what add-ons you would like changed.

TUNING METHOD

Our B-Spec E46 M3 tune is done via E-Flash. This is a 3-step process that is done via online file transfer from anywhere in the world. You send us your bin file. We create the tune. You flash. This method requires an FTDI based OBD2 diagnostic cable and a laptop. See our store page for a referral link to buy a BMW K+DCAN OBD2 cable. Detailed E-Flash instructions below.

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5 out of 5 How it should've came from the factory.

chriss1111 (verified owner)–May 14, 2018

I cannot stress this enough – if you have an M3, you need the tune. The car wakes up, and the transmission acts like it should have when it rolled off the showroom floor. The SMG is shifts MUCH better, and is exceptionally smooth. Flashing the tune is extremely simple, just make sure you have the correct K+DCAN cable. The customer service is great, Oscar was extremely prompt, and even made a point to get my tune made and sent out on a Sunday afternoon. I didn’t expect to get my tune back until Monday. No complaints, best $279 you can spend on your car.

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5 out of 5 For those who go to the track

gtumang (verified owner)–May 3, 2018

A lot of reviews rave about how the B-spec tune is great for the price. In my opinion, their tune is excellent even if I had to pay $750-$1,000. It’s right on par with the more expensive tune that I have experienced on other cars. I don’t really street drive my car and for the longest time I’ve been trying to leave my engine stock with the exception of a cat back exhaust. My car is primarily focused on developing the suspension setup. The exhaust makes it easier to hear my shift points on track. With that being said, every change made to my car can be quantified into time savings on track. With no other changes, the b-Spec tune helped me achieve a new personal best around Chuckwalla Valley Raceway with a 1.3 second decrease in time. The track conditions were about 25 degrees hotter than my last PB as well. The biggest benefit I saw from the tune was the increase in mid range power. It allowed me to leave downshift less and keep the car more composed on corner entry. The shift lights also were a nice touch that were surprisingly more useful than I thought they’d be. I’ve spent far more money on my car that has resulted in less of a time improvement. There is no better upgrade to your S54 powered car for the money.

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5 out of 5 If you haven't got this tune yet, what are you waiting for?!?!

phunguy8624 (verified owner)–April 29, 2018

I run a stock SMG and do not go tracking; however, it still provides a noticeable difference in the canyons and daily driving. First off, this tune is quite easy to install. Install were very straight forward and quick for anyone of any background, if you do the research ahead of time. (I ran into some issues on the flash but that was my fault with Windows XP PC) With the SMG update, the shift is much quicker. Whether it’s regular street driving or spirited driving, this tune has made the car feel much more alive and power is more consistent. Thank you to BuildJournal for making me fall in love my car all over again and thank you to Connie for the follow-up customer service.

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5 out of 5 Awesome, economical tune for catless headers.

Allison Leung (verified owner)–April 2, 2018

I highly recommend for catless setups, I have the aFe race headers. I went to Willow Springs this weekend and could feel noticeable gains around 6,000+ RPM, memory sport mode was very useful too. Upon startup the car is idling smoothly and disabling the SAP allows for some minor weight reduction in the engine bay. Extra add-ons like launch control, burble and shift lights are fun and cool points. Great customer service. #connieftw

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5 out of 5 Great tune with amazing customer service

brandene46 (verified owner)–March 29, 2018

Title says it all. The tune is amazing! I had this page bookmarked for a couple months not knowing if I wanted to really gamble my money on it. Well after talking to Connie at Buildjournal and their willingness to help out even though I wasn’t a customer just yet I felt more at ease. Long story short, if you are sitting there wondering if you should buy it or not, the answer is yes! You won’t be disappointed.

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5 out of 5 the best bang for your buck

Rg090481 (verified owner)–March 29, 2018

i love this tune it the best thing I ever did on my e46 m3 it makes the car feel so much more alive. It definitely makes a noticeable difference with just this tune and the customer support is the best i’ve ever seen. The people are extremely helpful and kind I cant thank them enough for all there help.

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5 out of 5 Glory

1sikh_M3 (verified owner)–March 28, 2018

Since buying this marvelous tune I have become a war hero, time traveled, made millions in the stock market, stopped drug wars, and made love to women across the world while hunting diamonds. Good buy.

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5 out of 5 You need this. Your M3 Needs it.

lukaskviet (verified owner)–March 28, 2018

I don’t even know what to say about the Tune, that’s not been said already.
The car just feels alive, and all the small little functions that the car lacked from the start, it now has.
Hands down – best deal on the market that has so many options to your regular daily driver, or winter storage sleeper.
The E46 M3 needs, what the Buildjournal has.

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5 out of 5 MUST DO for SMG Owners

drew__2123 (verified owner)–March 24, 2018

As many of the other m3 owners I was skeptical at first about paying for a flash tune. This is the first car that I have done it with, and even running catted I highly recommend it. The SMG update refreshes the way the m3 drives and it shifts so much quicker it’s ridiculous. The engine runs smoother and has a more linear power band now than before. The car feels more refined and easier to control at higher speeds in my opinion. I highly recommend doing this as soon as possible for SMG owners. Their customer service is great, and they’re very helpful people.

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5 out of 5 Great Product by Great Enthusiasts

Dylan Odell (verified owner)–March 21, 2018

Hands down best bang for your buck tune if you’re running a catless setup! Launch Control, Shift Lights, and Burble…. what more could you want. The Price is always a Bargain & 1/2!! Best Customer Service/Support in the Business, Highly Recommend it to anyone!! @Devil_M3

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5 out of 5 Best customer service and this tune is AMAZING! Just do it already!

AliG54 (verified owner)–March 21, 2018

Starting from the customer service down to helping me choose my tuning options before they made the final adjustments they geninely care! A lot of tuners make you wait on their time and just get back to you whenever but not with these guys! Now for the tune, MY GOD! The car feels faster throughout the powerband and wakes it up completely! Don’t hesitate when buying this tune and I guarantee you will not be disappointed!

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5 out of 5 Overall awesome product!

Patrickownt (verified owner)–March 16, 2018

I purchased my B Spec Tune 2 weeks ago and it transforms the behavior of the car. I recommend this tune to those who are looking to gain Whp and other cool features such as valet mode and launch control. This price is unbeatable for the amount of features you can get. Also, the customer service is spot on they answered all the questions i had and even let us know there will be new features added to this tune. The turn around time is about 1 whole day which is insane. Thank you to the peeps over at Buildjournal for developing such an rewarding tune!

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5 out of 5 Awesome affordable tune

Gabrielfa (verified owner)–March 12, 2018

Noticeable power gain all accross the powerband. Restored low end power since I decat the car. Best thing about it is that its actually affordable lol. Customer service is out of this world. Highly recommend it.

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5 out of 5 Best Bang for Your Buck Tune!

tresleches (verified owner)–March 4, 2018

I got this tune for my 6MT and boy did it really wake the car up! All the bells and whistles of this tune (launch control, shift lights, increased redline, etc.) make it well worth it. I don’t have headers yet, but am planning on it – so the $20 retune option was what really sold it for me. I also love that this group is always improving on the tune add-ons and how they’re free to existing customers.

Oh and when I bought the tune I had requested launch control at 3100. After flashing I found out that 3100 was a bit too much for my car. Oscar was nice enough to give me a new file at 2800. After flashing again, the launches are perfect. Now that’s what I call service!

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5 out of 5 Best money you can spend on a N/A e46 m3 hands down!

Mark412 (verified owner)–March 3, 2018

By far the best mod I have done to date the power is very noticible and the addons are perfect! the price is just a huge plus! And the customer service is top notch! They respond sometimes in minutes to your question! Mind blowing customer support and service! If u have a e46 m3 and u don’t have this tune. GET IT!

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Jace (verified owner)–February 7, 2018

Flashed my M3 a few weeks back. Customer service and the product is fantastic!

Burble – I had the burble tune already flashed, however it now seems to pop a lot louder and must be throwing flames. Yet to stick a gopro to the cars bum to record said flames. Hoping to do this soon.

Power – I was already running catless, so gains upon my M3 will be less than those published in the Build Journal’s dyno run. That said, there is an evident bump in available torque and power through the midrange. The car seems to be much more alive now. Power also continues all the way up to the redline.

All other options work as suggested. Awesome to now have shift lights.

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Patrick Katoc (verified owner)–February 1, 2018

The tune is awesome! The difference is noticable. Added more power in the midrange. Throttle response in sport mode is much smoother and shift are crisp(smg). The price is unbeatableTune was done within 24 hours.Highly recommended .Thank you guys!

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5 out of 5 Awesome tune made by cool people

Jin Endow (verified owner)–January 16, 2018

after running the tune on my car for a few weeks I can say that my car feels a lot better and pulls a lot harder. In the lower rpms, it feels like it did before making this tune perfect for daily driving. On the other hand, the higher rpms pull a lot harder all the way to the redline. Aside from the tune itself, the people over at buildjournal are super nice and were cool to chat with. Thanks guys!

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5 out of 5 Great Product, great customer service, at a great price

Alex James (verified owner)–January 15, 2018

I tuned my ’02 M3 with this tune a few weeks ago, and can agree with everything said previously..

Customer service was the first thing I noticed, and I immediately got the feeling that they will do anything they can to help me. There were a few options that they recommended for my particular setup, so they contacted me and told me why they recommended them, answering any questions I had. They sent my tune over in only a few hours after the order, and I obviously rushed to go flash it. Having already had the burble tune, that was nothing new (Burble is awesome though, gives it much more aggression). But then, I punched it. Immediately, I felt power in the low end that I’ve never felt before. I thought it would end there, and mid-high end would feel exactly the same – but no, it kept pulling and pulling. My butt dyno definitely felt some serious gains. The car feels like a different animal now, and puts the same smile on my face that I had when I first drove this car.

To summarize: Great customer service, very easy to install remotely, serious gains, great customization options, all for a very fair price. Props to the guys at Buildjournal! Quality mod all around.

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5 out of 5 Totally transforms your car if it was stock before

rivez (verified owner)–January 10, 2018

I’ve read countless threads and opinions about how pointless it is to get a tune for this car, everyone kept saying you can’t squeeze out more then the factory gave you. Good thing i never listened and now im here with a completely different, faster and sharper car. This tune is perfect, there are no drawbacks and the price basically makes it a steal. I highly recommend getting this and fast before these great guys realize they should be charging way more for the amount of joy their product provides.

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5 out of 5 Great Tune at a even Better price

John S. (verified owner)–December 7, 2017

I have every option except the burble and pop and I have nothing but great things to say about the tune. I feel like it really turned the S54 into the beast it should’ve been from the factory (paired with catless headers). The sport enhanced mode has to be my favorite option, it makes the gas pedal the perfect sensitivity level. The customer support is stellar, and the ease of flashing the tune is ultra simplistic. Don’t hesitate to purchase this tune, it has nothing but 5 star reviews for a reason.

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5 out of 5 Best customer service

Hudson –December 1, 2017

I was about to tune my E46 m3 with other brand. But all of them are more than 500 USD and seems like not willing to reply email. Than I found buildjournal on instagram and they answered all of the questions very fast. After I uploaded the bin, they shoot me back within 6 hours. So if you’re looking for a good flash for your m3 and good customer service for yourself, here’s the right place.

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5 out of 5 highly recomand build journals tune!!

Jesse Rangel –December 1, 2017

after struggling with the ess e-flash and there tunes making my car run really rich and flashing there “catless compatible” tune car was the same 02 sensors and all that will still go of and they would tell me something was wrong with my m3 so eventually i got tired of dealing with them gave build journal a shot and i was really impressed and happy the bspec tune was well worth the money fixed all the issues with my car what so ever even added the burble effect and i absolutely love it not only that but great customer service as well i highly recomand build journals tune!!

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5 out of 5 Best bang for your buck

Rod Ahmadi –November 22, 2017

I initially just got this tune to turn off the CEL due to going catless but once I installed it, I learned that it was so much more. The car idles better and definitely has more pull according to the trusty butt dyno. Will be back when I get another M3

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5 out of 5 Spectacular!!!

Zee Khan –November 21, 2017

I’ve loved my e46 m3 since the day I bought it and started modding it but with my euro headers and thus tune I am in love all over again. Service us above and beyond and the price is unbeatable. Above all the product is tried and tested and is Spectacular. Thanks buildjournal..

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5 out of 5 great off-the-shelf tune!

zivagolee –November 13, 2017

Spoke to customer service on FB before purchasing the tune and discussed my needs. The response was quick and informative.
The tune definitely improved throttle response and i don’t feel any flat spots when revving to 8100rpm 🙂
For the price, this is a very good off-the-shelf tune!

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5 out of 5 Great Services

Sai Vang (verified owner)–October 31, 2017

The customer service is great and they are willing to help out whatever they can. The B-Spec tune is great, I definitely don’t like a lot of Christmas lights on my dash and this did the job. I like everything about the tune. My favorite part is the valet mode, for when I lend out my car.
Money well spent

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5 out of 5 Best bang for the buck!

Anthony Hudson (verified owner)–October 22, 2017

Well having had this tune for over a week now I feel confident enough to say this is probably the best money you can spend on you m3 period.
Service is spectacular and I got my tune super quick! Extremely pleased there as I am super impatient. I still have stock headers with cats so no pops and fire for me (yet!) but I could instantly feel the difference the tune makes. I’ve had tunes on other Na cars and could barely feel the difference but hot damn there’s no doubt there’s extra hp here! Seriously impressed. Can’t wait to get my header installed and reflashed for the catless file and feel the real power. Seriously don’t wait. There’s no downside and it’s the cheapest thing you can do powerwise!

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5 out of 5 Increases drivability

vpcmotorsport (verified owner)–October 10, 2017

I did the basic tune, paired with the CSL SMG remap for me it has definitely made the car more drive-able. The car is stock otherwise. I will say the major difference is at around 5k RPM before, it was like a slingshot sensation and the lower RPMs were touch and go. It would sometimes shimmy and feel under powered under 3k RPMs. Now with the tune the power-band is very consistent. Engage sport mode or as I like to call it “M” mode and it turns my car insane. It’s like the whole car just wakes up and is very angry! One thing I have learned is to not engage sport mode while accelerating. It will start hopping because it is such a kick up. Other then that I am enjoying the tune!

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5 out of 5 Very Happy!

Alex Passos –August 30, 2017

This was my fist time attempting a tune on a car and the process was very simple and smooth! I fired up an old laptop with windows 7 and had no issues! The car does seem to pull harder, smoother and I love the add-ons! Disabling the cold start air pump and recalibrating the warmup lights has been awesome! No complaints so far! Great price!

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5 out of 5 Great tune for the price

Pablo Miranda (verified owner)–August 23, 2017

Had the tune for about 3 months now, and so far no issues whatsoever. I tested out the tune on the track and definitely saw and felt a difference. The car accelerated quicker and smoother out of turns with out the use of “sport” mode and when using sports mode It diffently felt alive. I definitely recomend this tune.

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5 out of 5 Speechless

Miles (verified owner)–August 15, 2017

Most of what I would say is covered by the other positive reviews here. That said, this is without a doubt the best $250 I’ve spent on the car. If you really want to bring your car to life don’t hesitate to buy this.

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5 out of 5 BSPEC

Allan Asturias (verified owner)–August 14, 2017

I got the B-Spec tune on my car about 2 months ago and I really wanted to get a good feel of the car before I wrote a review. The only mod I’m running on my M3 are headers and exhaust so the options I included were all the emissions related bits, shift lights, and enhanced throttle. Right off the bat you notice how much smoother the car runs with the tune. At idle it got rid of some of the roughness that comes with these cars and while on throttle it has a much more consistent and linear feel all the way up to 8000RPM which I attribute to the throttle remapping. There was definitely a gain in power with the tune not really noticeable down low though where you will notice it is up top. Above 6500RPM the car flys I was surprised when the car was keeping up or outrunning much bigger V8 cars ;). It might feel as the car has lost some lower end power but that’s not the case as I’ve come to figure out it’s just simply that much smoother pulls just as hard but without the jerkiness. After my headers install I had noticed a drop in midrange power. With the tune it greatly improved midrange power but it still lacks a little but that’s due to the headers id say. The car has been ran hard and has improved in terms power, and smoothness. Overall it’s safe to say the only regret I have is not getting the burble tune as it was included but i opted out of it. Great support and great people keep up the good work guys might have to go back soon to get the burble!

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5 out of 5 B-Spec tune track performance

Huy Vu (verified owner)–August 4, 2017

Tuned performed flawlessly. Super smooth, and there is definitely a power increase even with my Bimmerworld Race exhaust. Upper RPM it just pulls on the track. Glad I went with the buildjournal tune, for the price it’s the best bang for the buck. My car mostly lives on the track and I couldn’t ask for a better tune.

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2 out of 2 people found this helpful

5 out of 5 2001 M3 Catless

Winton Ray –July 19, 2017

Customer service has been great throughout the whole process! Any question I had was answered quickly. As far as the tune.. i fell in love with my car all over again! This is the most noticeable gain in power i have ever had with my car. Honestly the beat deal you can get for the money. Very impressed!

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5 out of 5 BUILDJOURNAL FOR LIFE

Harrison Schoen (verified owner)–June 9, 2017

You’d be crazy not to get a tune from these guys. It’s cheaper than any other tune on the market, yet The price certainly does not compromise the quality. Hey re very understanding and know exactly what they’re doing. My SMG has benefited significantly from the CSL and inertia update, and I also love the Valet mode and updated sport mode. They also helped clear an airbag code that was stuck on and I would buy from them again hands down.

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5 out of 5 Couldn't be happier! B Spec Catless

Brian Boly (verified owner)–June 4, 2017

I was incredibly surprised by how big the improvement was across the entire power band, I wasn’t expecting to notice the difference nearly as much as I did when I flashed it! Sport mode is incredibly smooth and so much better to drive with the pedal remapping. Stage 3 backfires are really cool, managed to get a video of a few flames with catless headers and the rest of the exhaust stock. Customer service was incredible, Connie and Oscar really made sure they got the car exactly how I wanted it. They went well out of their way to make sure the Valet mode was limited to just the right amount, and sent me a couple different files to try until I was satisfied. Definitely the best value by far out there for the E46 M3!

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5 out of 5 2006 E46 M3 (SMG & Euro Header)

Jonathan Tsoi (verified owner)–May 30, 2017

Tune is comparable to Evolve-R, Shark (not really a competition), and TTFS E-Flash. Best tune per price, B-Spec is the route to go. Rev match, SMG inertia, and low-mid range power gain is worth every dollar. Thank you Oscar, Andrew, and Connie for the great customer service.

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5 out of 5 Definitely recommend it.

Mike Crawford (verified owner)–May 23, 2017

The tune feels great and is easily noticeable, as well as adding in all the other features I wanted. There really is no better value for money, and the support I’ve received since purchasing has made me a very satisfied customer. If you’re thinking about buying but aren’t sure yet, be sure, it’s worth it.

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3 out of 3 people found this helpful

5 out of 5 I'm glad I went this route

Chris Madison (verified owner)–May 19, 2017

Their website DIYs made the installation a breeze and answered the questions I had about the process. From the time I had sent them the binary file of my factory ECU it was literally one hour before they sent back the new tune. Pretty impressive turnaround time and very user friendly process. The new tune has the standard “add-on” features of sport mode memory, 6mt shift lights, cold start delete, o2 cel delete, etc. and also gives a little bump in performance, as well as adding the burble feature when applying light throttle on deceleration.

While I’ve yet to put the car on the dyno to measure actual power gains, it feels quicker to me and friends who’ve ridden in my car before and after the new tune. The burble feature is something I honestly expected to be obnoxious and tiresome after a few days, but the more I drive the car the more I enjoy it. Under normal driving the only noticeable difference is a loud crack on WOT upshifts or a few burbles when upshifting at medium throttle. The big backfires and flames really only happen if the exhaust is hot and you go WOT up to redline and then feather the throttle while decelerating down. It’s nice that I can drive past cops and not draw too much attention to myself (at least any more than a SS Race section 3 normally draws haha).

All in all, I’m pretty happy with the tune. I kind of doubt it makes as much power as a custom tune from RK or TTFS, but for the cost and ease of install I’m glad I went this route. And again, I have nothing other than my butt dyno and a couple pulls against buddies telling me it’s marginally slower than those, nothing scientific here.

The customer service from the guys at buildjournal really surprised me considering the cost of their services. I was expecting to wait a day or two before my questions were answered and absolutely wasn’t counting on my tune being ready the same day I ordered it. Their behavior was on par with what I’d expect out of a much more expensive service, including following up a few days after I installed the tune to make sure everything was running well and I was happy with the product.

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5 out of 5 B-Spec Tune is bless

Azeez Patel (verified owner)–May 19, 2017

Just flashed my car, this is my first tune on my M3 and I couldn’t be happier. Turnaround time was less than 1 day.

-Great website with detailed info and step-by-step instructions. I contacted them on IG and they were able to answer my questions in detail. The B-Spec tune is perfect for a beginner, the process was extremely smooth.

-I felt some gains after installing the euro headers, but this tune definitely brought that mod to full potential. From mid-range to redline it just pulls hard and feels like it wants to keep going.

-I was pleasantly surprised to see the 6MT shift lights work on my ’01. I thought it would only work on 03+ clusters. Still need to try to the new sport mode.

-Backfire sounds dope, and is controllable.. shouldn’t happen randomly. You have to let off the throttle after punching it, like around 4k. Rest of the exhaust sounds normal. This is good for me as I’m not trying to catch extra heat from cops.

My engine light is finally gone! No more error codes for deleting my SAP and secondary o2 sensors. If I pass e-test (just obd plug-in) I’m laughing. Just need to make sure the monitors show as ready or not applicable.

Overall… B-Spec Tune is bless. Major props to the guys for bringing this great affordable tuning option to the market.

5 out of 5 AMAZING TUNE!!

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5 out of 5 You're not just paying for just the tune...

Victor (verified owner)–May 15, 2017

Looked into this tune after getting my headers installed. You can definitely feel more midrange power during WOT. Not sure if its just a placebo, but I feel like my car runs a lot better with the tune flashed into my car. First attempt at flashing my car wasn’t the best, BUT the guys at Buildjournal I got to say really know how to take care of you. Messaged them right after the problem occurred, got a reply in minutes, and then they helped me fix it right away. I went for the Stage 3 Backfire option with my B-Spec tune, and the first crackle pop I heard gave me the biggest smirk during a test drive. Going to be taking my car on a track day to see how the tune does for me.

Best bang for buck tune you can get as of right now. Other tunes could run you $500+, but you could save a couple hundred dollars for a few track days by purchasing this tune. You’re not just paying for the tune, you’re paying for the incredible customer support. These guys are definitely out here trying to help out our fellow M3 owners! Give the tune a try!

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5 out of 5 Great Tune!

Philip Lee (verified owner)–May 13, 2017

I love the tune! Definite gains in the midrange and love not having the CEL on and having to press the sport button each time! Customer service was excellent too! Questions were answered within minutes and I received the tune in the same day.

5 out of 5 Great tune that won't break the bank.

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3 out of 3 people found this helpful

5 out of 5 The midrange!!!

Cory (verified owner)–May 5, 2017

I love the midrange pull after the tune. I did a track event at sow about a week after I had Andrew and Oscar flash the car and it pulled strong and flawless all day. Even a few other buddies with e46 will be getting the tune after feeling the difference accelerating out of the corners. The match reving makes me feel like I’m heeltoeing like I used to. Thy were also able to remove my cel due to my BMW motorsports thermostat, so I was able to smog my car! A+ Would recommend & have recommended!